.Box {
  height: 200px;
  width: 400px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.Box span {
  height: 40px;
  font-weight: 600;
  font-size: 30px;
  line-height: 40px;
}

.Box .num {
  height: 40px;
  width: 30px;
  background-color: black;
  position: relative;
  overflow: hidden;
  border-radius: 6px;
  margin-left: 4px;
}

.Box .num .content {
  width: 30px;
  font-size: 30px;
  color: white;
  position: absolute;
  transition: transform 300ms;
  line-height: 40px;
  text-align: center;
}
